unidasm -arch cop444 doesn't recognize the extra RAM and ROM in the COP444. I noticed this before but thought it got fixed. I just checked git and it's still an issue. It affects the disassembly of JMP, JSR, JP, LBI, LDD, and XAD; the jumps need an extra address bit and the others need an extra Br bit. The Dalla$ ROM dump has over 100 invalid opcodes with the current code.